Basic of Water Tank

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WATER TANK
Presenting by Prof. Umesh S. Salunkhe Ph. D.
(Sch) M.E. in (Structure ), B.Tech. (Civil), DCE
Department Of Civil Engineering Shreeyash
College Of Engineering And Technology,
Aurangabad, Maharashtra.
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Introduction of Prestressed Concrete

1. Def n
2. Classification
3. Types
4. Shapes
5. Underground Water Tank
6. Resting on Ground
7. Elevated Store Reserviour
8. IS Code Method
9. WSM

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• INTRODUCTION

• Storage tanks are built for storing water,
  liquid petroleum, petroleum products and similar
  liquids
• Designed as crack free structures to eliminate
  any leakage
• A crack width of 0.1mm has been accepted as
  permissible value in liquid retaining structures
• Cement content ranging from 330 Kg/m3 to 530
  Kg/m3 is recommended in order to keep shrinkage
  low.

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• Code of Practice for the storage of Liquids-
  IS3370 (Part I to IV)
• Fractured strength of concrete is computed using
  the formula given in clause 6.2.2 of IS 456 -2000
  ie., fcrSq. Root of 0.7fck MPa.
• Allowable stresses in reinforcing steel as per
  IS 3370 are
• ?st 115 MPa for Mild steel (Fe250) and
• ?st 150 MPa for HYSD bars(Fe415)

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• In order to minimize cracking due to shrinkage
  and temperature, minimum reinforcement is
  recommended as
• For thickness (t) 100 mm 0.3
• For thickness (t) 450 mm 0.2
• For thickness between 100 mm to 450 mm varies
  linearly from 0.3 to 0.2
• For concrete thickness (t) 225 mm, two layers of
  reinforcement be placed, one near water face and
  other away from water face.

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• Cover to reinforcement is greater of i) 25 mm,
  ii) Diameter of main bar
• For tension on outer face?st 140 MPa for Mild
  steel and ?st 230 MPa for HYSD bars
• For concrete thickness ? 225 mm, two layers of
  reinforcement be placed, one near water face and
  other away from water face.

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RESTING ON GROUND
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UNDERGROUND
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ELEVATED
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CIRCULAR
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RECTANGULAR
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SPHERICAL
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INTZ
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CONICAL BOTTOM
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RECTANGULAR WATER TANKS RESTING ON GROUND
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Introduction

• Rectangular tanks are used when the storage
  capacity is small
• Rectangular tanks should be preferably square in
  plan from point of view of economy.
• It is also desirable that longer side should not
  be greater than twice the smaller side.
• Moments are caused in two directions of the wall
  i.e., both in horizontal as well as in vertical
  direction
• The walls are designed both for direct tension
  and bending moment.

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• When the height is large in comparison to its
  length, the moments will be in the horizontal
  direction and panel bends as a thin slab
  supported on edges.
• For intermediate condition bending takes place
  both in horizontal and vertical direction.
• In addition to the moments, the walls are also
  subjected to direct pull exerted by water
  pressure on some portion of walls.
• When the length of the wall is more in comparison
  to its height, the moments will be mainly in the
  vertical direction, i.e., the panel bends as
  vertical cantilever .

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Introduction
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Introduction

• IS3370 (Part-IV) gives tables for moments and
  shear forces in walls for certain edge condition.
• IS3370 provides coefficient for max Bending
  moments in horizontal and vertical direction.

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Step4 Design for Horizontal moment

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Step5 Base Slab

• The slab is resting on firm ground. Hence nominal
  thickness and reinforcement is provided. The
  thickness of slab is assumed to be 200 mm and
  0.24 reinforcement is provided in the form of 8
  _at_ 200 c/c. at top and bottom
• A haunch of 150 x 150 x 150 mm size is provided
  at all corners

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Detailing

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Detailing

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GOOD DAY
Prof. U. S. salunkhe Civil Engineering
Department SYCET Aurangabad- 431010 Mob
9595576676 / 8484033324
Email umeshcivil_at_gmail.com umesh.salunkhe_at_sycet.o
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